US5856656A - Electrical grounding arrangement for a printed circuit board of a microwave oven - Google Patents

Electrical grounding arrangement for a printed circuit board of a microwave oven Download PDF

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Publication number
US5856656A
US5856656A US08/897,310 US89731097A US5856656A US 5856656 A US5856656 A US 5856656A US 89731097 A US89731097 A US 89731097A US 5856656 A US5856656 A US 5856656A
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United States
Prior art keywords
microwave oven
circuit board
printed circuit
control panel
pcb
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/897,310
Inventor
Geun-Soo Kim
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Filing date
Publication date
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Assigned to SAMSUNG ELECTRONICS CO., LTD. reassignment SAMSUNG ELECTRONICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KIM, GEUN-SOO
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Publication of US5856656A publication Critical patent/US5856656A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K9/00—Screening of apparatus or components against electric or magnetic fields
    • H05K9/0007—Casings
    • H05K9/002—Casings with localised screening
    • H05K9/0039—Galvanic coupling of ground layer on printed circuit board [PCB] to conductive casing
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6435—Aspects relating to the user interface of the microwave heating apparatus

Definitions

  • the present invention relates to a microwave oven, and more particularly to a microwave oven for automatically grounding a printed circuit board to a body of a microwave oven when the printed circuit board is fastened to a control panel.
  • a microwave oven is designed to generate microwaves to heat and cook the food, where the microwave oven is disposed at a body thereof with a control panel equipped with a manipulating key.
  • PCB printed circuit board
  • the PCB 1 is secured to a plastic control panel 3 by way of a plurality of screws (2-1, 2-2, 2-3 and 2-4).
  • a ground pattern formed at the PCB 1 and a body 4 of the microwave oven made of steel are connected by a ground wire 5 to thereby ground the PCB 1 to the body 4 of the microwave oven.
  • an example of a microwave oven disclosed in Japanese Patent Application Laid-Open Publication No. Hei-8-233286 has a construction where a PCB is screwed to an inner side of a panel disposed with a manipulating key, so that a screw fastening member cannot be forgotten in fastening.
  • the PCB is formed with a screw hole through which the PCB is fastened via a fastening screw to an inner side of the panel disposed with a manipulating key.
  • the PCB is formed with a screw hole which in turn renders same unconductive, but the PCB is rendered conductive by way of the screw being plugged into the screw hole.
  • a microcomputer 10 connected to the PCB can discriminate whether or not a screw is inserted thereinto according to a potential of the PCB.
  • the conventional microwave oven thus constructed can only discriminate whether or not a screw for fixing the PCB to a control panel is accurately fastened.
  • the present invention is presented to solve the afore-mentioned problem and it is an object of the present invention to provide a microwave oven capable of automatically connecting a PCB to a body of a microwave oven to thereafter be grounded when the PCB is screwed and fixed to a control panel.
  • a microwave oven formed with a screw hole at a tip end of a bar extended from a body thereof and having a jumper wire connected to a ground pattern at around a screw hole formed at a printed circuit board while a bolt is screwed to a control panel through a screw hole formed at the tip end of the bar and through a screw hole formed at the printed circuit board are connected by the jumper wire, so that the printed circuit board is automatically connected and grounded to the body of the microwave oven when the printed circuit board is fastened to the control panel.
  • FIG. 1 is a schematic diagram for illustrating a ground structure of a printed circuit board of a microwave oven according to one embodiment of the prior art
  • FIG. 2 is a circuit diagram for illustrating a screw detecting circuit of a microwave oven according to another embodiment of the prior art
  • FIG. 3 is a schematic diagram for illustrating a ground structure of a printed circuit board in a microwave oven according to the present invention.
  • FIG. 4 is a sectional view taken along line a-a' in FIG. 3.
  • FIG. 3 is a schematic diagram for illustrating a ground structure of a printed circuit board in a microwave oven according to the present invention
  • FIG. 4 is a sectional view taken along line a-a' in FIG. 3, where, a bar 13 extended from a body 11 of the steel-made microwave oven is formed and a screw hole 15 is formed at a tip end of the bar 13, while, a printed circuit board 17 (hereinafter referred to as PCB) is formed with a plurality of screw holes (21-1, 21-2, 21-3 and 21-4) and a jumper wire 19 connected to a ground pattern is secured around one of the plurality of screw holes (21-1, 21-2, 21-3 and 21-4).
  • PCB printed circuit board 17
  • a bolt 25 is screwed to a control panel 23 through the screw hole 15 formed at the tip end of the bar 13 and through a screw hole 21-4 formed at the PCB 17 while the bar 25 and the PCB 17 are connected by the jumper wire so that the PCB 17 is automatically connected and grounded to the body 11 of the microwave oven when the PCB 17 is fastened to the control panel 23.
  • the bolt 25 is screwed to the screw hole 15 formed at the tip end of the bar 13 extended from the body 11 of the steel-made microwave oven, and then the bolt 25 is screwed to the screw hole 21-1 formed at the PCB 17 with the jumper wire 19 formed at the PCB 17 lying therebetween, wherely the bolt 25 is inserted into the screw hole 21-1 formed at the PCB 17 to thereby be screwed into the control panel 23 of plastic material.
  • the jumper wire 19 connected to the ground pattern of the PCB 17 contacts the bar 13 extended from the body 11 of the microwave oven.
  • the PCB 17 is grounded to the body 11 of the microwave oven via the jumper wire 19 and the bar 13.
  • a PCB is automatically grounded to a body of a microwave oven when the PCB is fastened to a control panel to thereby provide a convenience in assembly of the microwave oven and a stability to the microwave oven.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electric Ovens (AREA)
  • Constitution Of High-Frequency Heating (AREA)

Abstract

The present invention relates to a ground structure of a printed circuit board in a microwave oven, where the microwave oven formed with a screw hole at a tip end of a bar extended from a body thereof and having a jumper wire connected to a ground pattern at around a screw hole formed at a printed circuit board while a bolt is screwed to a control panel through a screw hole formed at the tip end of the bar and through a screw hole formed at the printed circuit board are connected by the jumper wire, so that the printed circuit board is automatically connected and grounded to the body of the microwave oven when the printed circuit board is fastened to the control panel, thereby providing a convenience in assembly of the microwave oven and a stability thereto.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a microwave oven, and more particularly to a microwave oven for automatically grounding a printed circuit board to a body of a microwave oven when the printed circuit board is fastened to a control panel.
2. Description of the Prior Art
Generally, a microwave oven is designed to generate microwaves to heat and cook the food, where the microwave oven is disposed at a body thereof with a control panel equipped with a manipulating key.
The printed circuit board (hereinafter referred to as PCB) for electrically controlling the microwave oven according to a signal input through the manipulating key is fastened and fixed to an inner side of the control panel.
In the conventional microwave oven thus constructed and illustrated in FIG. 1, the PCB 1 is secured to a plastic control panel 3 by way of a plurality of screws (2-1, 2-2, 2-3 and 2-4).
At this location, a ground pattern formed at the PCB 1 and a body 4 of the microwave oven made of steel are connected by a ground wire 5 to thereby ground the PCB 1 to the body 4 of the microwave oven.
However, there is a problem in a ground structure of a PCB according to the prior art thus constructed, in that a separate ground wire 5 must be pulled out of the PCB 1 to be connected to the body 4, which leads to inconveniences in assembly of the microwave oven.
Furthermore, there is another problem in that an operator often forgets to connect the ground wire 5 to the body 4 of the microwave oven to thereby cause a safety problem because the PCB 1 is not grounded to the body 4.
Meanwhile, an example of a microwave oven disclosed in Japanese Patent Application Laid-Open Publication No. Hei-8-233286 has a construction where a PCB is screwed to an inner side of a panel disposed with a manipulating key, so that a screw fastening member cannot be forgotten in fastening.
In the microwave oven thus constructed as illustrated in FIG. 2, the PCB is formed with a screw hole through which the PCB is fastened via a fastening screw to an inner side of the panel disposed with a manipulating key.
At this time, the PCB is formed with a screw hole which in turn renders same unconductive, but the PCB is rendered conductive by way of the screw being plugged into the screw hole.
Accordingly, a microcomputer 10 connected to the PCB can discriminate whether or not a screw is inserted thereinto according to a potential of the PCB.
The conventional microwave oven thus constructed can only discriminate whether or not a screw for fixing the PCB to a control panel is accurately fastened.
SUMMARY OF THE INVENTION
The present invention is presented to solve the afore-mentioned problem and it is an object of the present invention to provide a microwave oven capable of automatically connecting a PCB to a body of a microwave oven to thereafter be grounded when the PCB is screwed and fixed to a control panel.
In accordance with the object of the present invention, there is provided a microwave oven, the microwave oven formed with a screw hole at a tip end of a bar extended from a body thereof and having a jumper wire connected to a ground pattern at around a screw hole formed at a printed circuit board while a bolt is screwed to a control panel through a screw hole formed at the tip end of the bar and through a screw hole formed at the printed circuit board are connected by the jumper wire, so that the printed circuit board is automatically connected and grounded to the body of the microwave oven when the printed circuit board is fastened to the control panel.
BRIEF DESCRIPTION OF THE DRAWINGS
For fuller understanding of the nature and objects of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram for illustrating a ground structure of a printed circuit board of a microwave oven according to one embodiment of the prior art;
FIG. 2 is a circuit diagram for illustrating a screw detecting circuit of a microwave oven according to another embodiment of the prior art;
FIG. 3 is a schematic diagram for illustrating a ground structure of a printed circuit board in a microwave oven according to the present invention; and
FIG. 4 is a sectional view taken along line a-a' in FIG. 3.
DETAILED DESCRIPTION OF THE INVENTION
The present invention will now be described in detail with reference to the accompanying drawings.
FIG. 3 is a schematic diagram for illustrating a ground structure of a printed circuit board in a microwave oven according to the present invention and FIG. 4 is a sectional view taken along line a-a' in FIG. 3, where, a bar 13 extended from a body 11 of the steel-made microwave oven is formed and a screw hole 15 is formed at a tip end of the bar 13, while, a printed circuit board 17 (hereinafter referred to as PCB) is formed with a plurality of screw holes (21-1, 21-2, 21-3 and 21-4) and a jumper wire 19 connected to a ground pattern is secured around one of the plurality of screw holes (21-1, 21-2, 21-3 and 21-4).
Furthermore, a bolt 25 is screwed to a control panel 23 through the screw hole 15 formed at the tip end of the bar 13 and through a screw hole 21-4 formed at the PCB 17 while the bar 25 and the PCB 17 are connected by the jumper wire so that the PCB 17 is automatically connected and grounded to the body 11 of the microwave oven when the PCB 17 is fastened to the control panel 23.
Now, operational effect of the microwave oven thus constructed will be described in detail.
The bolt 25 is screwed to the screw hole 15 formed at the tip end of the bar 13 extended from the body 11 of the steel-made microwave oven, and then the bolt 25 is screwed to the screw hole 21-1 formed at the PCB 17 with the jumper wire 19 formed at the PCB 17 lying therebetween, wherely the bolt 25 is inserted into the screw hole 21-1 formed at the PCB 17 to thereby be screwed into the control panel 23 of plastic material.
When the PCB 17 is fixed to the control panel 23, the jumper wire 19 connected to the ground pattern of the PCB 17 contacts the bar 13 extended from the body 11 of the microwave oven.
Successively, the PCB 17 is grounded to the body 11 of the microwave oven via the jumper wire 19 and the bar 13.
As apparent from the foregoing, there is an advantage in the microwave oven according to the present invention, in that a PCB is automatically grounded to a body of a microwave oven when the PCB is fastened to a control panel to thereby provide a convenience in assembly of the microwave oven and a stability to the microwave oven.

Claims (1)

What is claimed is:
1. A microwave oven comprising a body, a non-metallic control panel mounted on the body, and a printed circuit board attached to the control panel; the printed circuit board including a first hole and a ground pattern extending around the first hole, a jumper wire on an upper surface of the printed circuit board and disposed in electrically conducting engagement with the ground pattern, the body including a metallic bar extending across a portion of the printed circuit board containing the jumper wire and including a second hole; a fastening screw extending through the first and second holes within an area bordered by the jumper wire and connected to the control panel for attaching the circuit board to the control panel, and simultaneously pressing the bar into direct engagement with the jumper wire to electrically ground the ground pattern to the body.
US08/897,310 1996-07-29 1997-07-21 Electrical grounding arrangement for a printed circuit board of a microwave oven Expired - Fee Related US5856656A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR199622582 1996-07-29
KR19960022582 1996-07-29

Publications (1)

Publication Number Publication Date
US5856656A true US5856656A (en) 1999-01-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
US08/897,310 Expired - Fee Related US5856656A (en) 1996-07-29 1997-07-21 Electrical grounding arrangement for a printed circuit board of a microwave oven

Country Status (7)

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US (1) US5856656A (en)
EP (1) EP0822734B1 (en)
JP (1) JP2818160B2 (en)
KR (1) KR100239514B1 (en)
CN (1) CN1093621C (en)
DE (1) DE69718252T2 (en)
MY (1) MY117375A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030234117A1 (en) * 2002-06-25 2003-12-25 Poglitsch Lawrence R. Ground connector assembly with substrate strain relief and method of making same
US20130107128A1 (en) * 2011-11-01 2013-05-02 Samsung Electronics Co., Ltd. Television tuner module and broadcast receiving apparatus having the same
US20220079191A1 (en) * 2019-01-04 2022-03-17 Haier Smart Home Co., Ltd. Refrigerating and freezing device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100414178C (en) * 2003-02-21 2008-08-27 乐金电子(天津)电器有限公司 Ground-engaging arrangement of microwave oven
CN100455893C (en) * 2003-07-29 2009-01-28 乐金电子(天津)电器有限公司 Earthing structure for control panel of microwave oven
CN100465519C (en) * 2003-12-12 2009-03-04 乐金电子(天津)电器有限公司 Control assembly of microwave oven
KR100556609B1 (en) 2004-02-20 2006-03-06 삼성전자주식회사 Microwave oven
EP2527746B1 (en) * 2010-01-21 2020-06-24 LG Electronics Inc. Control panel for a microwave oven
CN206713185U (en) * 2017-03-21 2017-12-05 赤多尼科两合股份有限公司 Circuit board assemblies

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823235A (en) * 1986-02-06 1989-04-18 Fujitsu Limited Earth connection device in metal core printed circuit board
JPH02250287A (en) * 1989-03-23 1990-10-08 Matsushita Electric Ind Co Ltd High frequency heating device
JPH05205868A (en) * 1992-01-22 1993-08-13 Sanyo Electric Co Ltd High frequency heating apparatus
JPH08233286A (en) * 1995-02-28 1996-09-10 Toshiba Corp Microwave range
US5563761A (en) * 1995-08-11 1996-10-08 The Whitaker Corporation Transient voltage surge protection assembly for telecommunications lines
US5644474A (en) * 1995-04-28 1997-07-01 Daewoo Electronics Co., Ltd. Video cassette recorder incorporating therein a grounding system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57144826A (en) * 1981-03-02 1982-09-07 Matsushita Electric Ind Co Ltd Heating cooker
DE8213627U1 (en) * 1982-05-11 1982-08-19 Siemens AG, 1000 Berlin und 8000 München Pluggable circuit board for electrical communications engineering
DE8711015U1 (en) * 1987-08-12 1987-10-08 Tandberg Data A/S, Oslo Keyboard
IT8819772A0 (en) * 1988-03-15 1988-03-15 Honeywell Bull Spa GROUND SELECTIVE DEVICE FOR ELECTRONIC EQUIPMENT.
KR950012114U (en) * 1993-10-07 1995-05-16 Grounding Structure of Microwave Oven Control Unit

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4823235A (en) * 1986-02-06 1989-04-18 Fujitsu Limited Earth connection device in metal core printed circuit board
JPH02250287A (en) * 1989-03-23 1990-10-08 Matsushita Electric Ind Co Ltd High frequency heating device
JPH05205868A (en) * 1992-01-22 1993-08-13 Sanyo Electric Co Ltd High frequency heating apparatus
JPH08233286A (en) * 1995-02-28 1996-09-10 Toshiba Corp Microwave range
US5644474A (en) * 1995-04-28 1997-07-01 Daewoo Electronics Co., Ltd. Video cassette recorder incorporating therein a grounding system
US5563761A (en) * 1995-08-11 1996-10-08 The Whitaker Corporation Transient voltage surge protection assembly for telecommunications lines

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030234117A1 (en) * 2002-06-25 2003-12-25 Poglitsch Lawrence R. Ground connector assembly with substrate strain relief and method of making same
US6740824B2 (en) * 2002-06-25 2004-05-25 Motorola, Inc. Ground connector assembly with substrate strain relief and method of making same
US20130107128A1 (en) * 2011-11-01 2013-05-02 Samsung Electronics Co., Ltd. Television tuner module and broadcast receiving apparatus having the same
US9819893B2 (en) * 2011-11-01 2017-11-14 Samsung Electronics Co., Ltd. Television tuner module and broadcast receiving apparatus having the same
US20220079191A1 (en) * 2019-01-04 2022-03-17 Haier Smart Home Co., Ltd. Refrigerating and freezing device

Also Published As

Publication number Publication date
EP0822734A1 (en) 1998-02-04
JP2818160B2 (en) 1998-10-30
CN1093621C (en) 2002-10-30
CN1172230A (en) 1998-02-04
KR100239514B1 (en) 2000-01-15
MY117375A (en) 2004-06-30
KR980010148A (en) 1998-04-30
DE69718252D1 (en) 2003-02-13
EP0822734B1 (en) 2003-01-08
JPH10169994A (en) 1998-06-26
DE69718252T2 (en) 2003-10-30

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